Lizzie Grubman’s friends spirited her away from the scene of her notorious Conscience Point nightclub accident last summer and spent hours trying to sober her up – including putting her in a shower and pumping her full of caffeine, a source has told The Post.

The source, who is close to the case, said Grubman’s former boyfriend, club owner Andrew Sasson, and another man took the public-relations princess from the Southampton hot spot to Sasson’s home before police arrived.

They left behind Mercedes SUV where it had stopped after hitting a crowd of people, injuring 14.

“They took her away from the scene,” the source said. “She showered and changed clothes. They fed her coffee and chocolate and they walked her around.

“They got her coherent.” Then, hours later, “They brought her back to the scene to see the police,” the source said.

Because of the passage of time, police did not test Grubman for alcohol.

Sasson declined to comment on what his testimony at Grubman’s trial will be.

Stephen Scaring, Grubman’s lawyer, denied all the allegations.

“There was never any attempt to obstruct justice or cover up any evidence,” Scaring told The Post.

“She was not intoxicated,” he said.

Meanwhile, sources have revealed new details about Grubman’s behavior before she left the trendy club and backed her car into the crowd July 7.

Grubman launched a foul-mouthed screaming attack on an employee of the nightclub – hissing a racial epithet at a ladies-room attendant who refused to let her cut in line, the sources said.

Scaring, Grubman’s lawyer, said she “emphatically denies” using the racial epithet or being abusive to the restroom attendant.

But at least two witnesses later told investigators Grubman screamed at the woman and threatened to have her fired.

Shortly after the incident, the attendant told others Grubman used a dismissive racial epithet and ordered her to “get out of the way,” a source said.

The attendant, whose name The Post is withholding, confirmed the account, but would not comment further.

Grubman has been accused of calling at least one male club employee “white trash” and threatened to have him fired.

That employee, security guard Scott Conlon, was hit by the SUV and injured. He is suing Grubman in Civil Court.

Meanwhile, a Nassau County prosecutor was appointed yesterday to handle the case, even though the incident took place in Suffolk. The Suffolk district attorney has disqualified his office because Grubman’s chief private investigator works for him.